Strap pipe-wrench.



No. 876,469. PATENTED JAN. 14, 1908. W. G. MARTIN 61: L. H. OGDEN. STRAP PIPE WRENCH.

APPLICATION FILED OUT. 7, 1907.

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UNITED STATES PATENT OFFICE.

WILLIAM G. MARTIN, OF MANSFIELD, AND LOUIS H. OGDEN, OF SOUTH BOSTON, MASSACHU- SETTS, ASSIGNORS TO MARTIN & OGDEN \VltlfiiNCl'l 00M PANY, A CORPORATION OF MASSA- (lHUS ETTS.

STRAP PIPE-WRENCH.

Specification of Letters Patent.

.Patented Jan. 14, 19.08.

T cell whom it may concern:

Be it known that we, WILLIAM G. MARTIN, of 32 School street, Mansfield, in the county of Bristol and Commonwealth of Massachusetts, and LOUIS H. OGDEN, of 5 1? street, South Boston, in the county of Suffolk and said Commonwealth, both citizens of the United States, have invented certain new and useful Improvements in Strap Pipe- Wrenches, of which the following is a specification.

The object of this invention is the construction of a strap pipe wrench wherein the strap can be more readily wrapped about the pipe to be turned, more quickly and easily reenga ed by the wrench, and more securely ocked in place; also a wrench adapted to have its cooperating strap secured thereto without further labor than punching a hole through it atone end'and inserting an ordinary screw therethrough; and, finally, a

wrench which shall embody certain other improvements in detal of construction.

Referring to the drawings formin part of this specification, Figure 1 is a si e elevation of a wrench made in accordance with my invention, a part thereof being represented as broken away on the line XX in Fig. 2. Fig. 2 is a plan view of the wrench head with the locking cam removed. Fig. 3 is a erspective view of the locking cam by itself.

The pipe 1 which is shown in section in a Fig. 1, and which represents the one to which the wrench is being-applied, has the strap 2 passed about it in a manner to tighten the grip of such stra thereon in proportion as the handle 3 of t e wrench is forced down- 'ward; such grip being sufiicient to turn the pipe with the swing of the wrench. One end of said strap is secured to the locking cam 4 by a screw and washer 5, 6; the extremity of said end fitting the seat 7 of said cam; the latter being rotatably held between the walls 10 of the wrench head. 11, by the pin 12. From said seat, the strap passes about the convex face 13 of said cam 4 between said walls, andthence about the pipe 1 and down throu h the space included between said cam and t e inclined surface 14 at the base of said walls. When, now, the handle 3 is forced downward, the convex surface of the locking cam 4 and said inclined surface grip the two strap-sections between them, and

lock the same against withdrawaL- The nose 15 of said cam, resting in the fold of the. under section of strap, now becomes the fulcrum of the lever or handle 3, and the harder the latter is. swung toward the left, the more tightly the bight of the strap encircles the pipe. So strong is this grip that even polished brass or nickeled lpiping will be forced to turn with the wrenc 1.

By having the inclined throat surface 14 at the proper angle, the wrench pressure is incapable of causing the strap to pull out therefrom even a fraction of an inch. Inasmuch as both sections of the strap are simul taneously locked by the operating pressure of the wrench, it is evident that there is no strain upon the screw 5, and no danger of the belt breaking or splitting thereat.

When the handle 3 is elevated to a horizontal position, or slightly higher, with the loclling cam remaining at its illustrated osition, the throat opening becomes so arge as to permit the free end of the strap to be thrust through the same, after' having passed it about the pi c, with the greatest of ease. When one en of the strap becomes worn, it is the work of but a moment to take out the screw 5, reverse the strap and insert the screw through a hole punched therein. If no tool is handy, agood sizedwire nail can be driven into the strap to form the required screw hole, A new strap can be substituted for the old one with equal easel Inasmuch as the strap has both sections gripped by the locking means described, the wrench could be made to work fairly Well without having an end of the strap secured to the cam 4, so that the strap could be entirely separate from the remainder of the tool. This would be objectionable, however, on account of the constant losing of the strap, and also because the Wrench would not be nearly so conveniently manipulated. So, also, the strap-end now shown secured to the locking cam could be entirely free therefrom, and the opposite end of the strap fastened to the Wrench instead; but this would be quite inconvenient in use as compared with the construction set forth.

What we claim as our invention and for which we desire Letters Patent is as follows to wit g 1. A wrench comprising a handle having a head formed with a pair of parallelwalls, a locking cam pivotally sup orted near one end between said walls, and havingits 0p Tcili'i'ii'd convex, and a strap having both ing cam located between said jaws, a pin 15 ends penetrating the space between the penetrating said cam and walls, an inclined convex end of said cam and the surface of surface at the base of said walls coacting said head between said walls, and held by with said cam, and a strap secured at one the clamping action of said end and surface. end to said cam and passing through the 2. A wrench comprising a handle having space between said cam and inclined surface. 20 a head formed with a pair of parallel walls, In testimony that we claim the foregoing a locking cam pivotally supported between invention, we have hereunto set our hands said walls and having a shouldered seat at this 4th day of October, 1907.

one side and a convex face opposite thereto, WILLIAM C. MARTIN. a strap having one end located in said seat, LOUIS H. OGDEN. and a screw securing said end to said cam. Witnesses:

3. A wrench comprising a handle having A. B. UPHAM,

a head formed with a pair of walls, a lock- WARnEN N. AKERS. 

